Machine for shaping articles by grinding



y M. A. EATON. f MACHINE FOB SHAPING ARTICLES'BY GBlNDlN-G.

APPLICATION lFILED MAR. I3. |920.

' Patented May 3, 1921.

2 SHEEIS-SHEET l.

IVI. A.'EATON. MACHINE FOR'SHAPING ARTICLES BY GRINDING.

APPLICATION FILED MAR.`I3, 1920. I l lil l 8. Patented-.May 3, 1921.

42 SHEETS-SHEET 2.

MALVERN A. EATON, 0F LET'ILI.|F '1ON,v NEW HAMPSHIRE, ASSIGNOR TO PIKEMANU- FACTURING COMPANY, OF PIKE, NEVI HAMPSHIRE A CORPORATION OF NEWHAMPSHIRE.

Specification of Letters Patent.

intenten tray a, resi.

Application ledMarch 13, 1920. Serial No. 365,612. Y

the following is a description, reference being had to the accompanyingdrawings, forming a part hereof.

My invention relates to grinding machines vtor truing and finishing theends of sharpening stones such as oil stones, whet stones and the like,and other articles, and has for its object to provide a machine for thispurpose which willbe simple and comparatively inexpensive inconstruction and operation and will be eiiective to grind the ends of aconsiderable number of stones or other articles at the same time. Y Afurther object of the invention is to provide simple and effectivemechanism toreciprocate the stones or other articles across the face ofthe grinding means. A further object of the invention is to providemeans for regulating the pressure of the stones or other articles to beground, against the grinding means.

A A further object of the invention is to provide means by which thestones or other articles t0 be ground may be conveniently inserted inand removed from the machine.

With the above described objects and other objects hereinafter describedin view my invention consists in the construction andl combination ofelements hereinafter described and claimed.

Referring to the drawings;

Figure 1 is a side elevation of a complete machine for grinding the endsof sharpen- Ving stones embodying my invention,

Fig. 2 is an end view of the machine shown inrFig. 1,

Fig. 3 is a fragmentary cross sectional View online 3-3 of Fig. 1 on anenlarged scale, Y

grinding disk preferably consisting of a disk of cast iron supplied withsand or other finely divided abrasive material and water, by anyconvenient means. 2 indicates a cross beam preferably of 1 shape incross section,-supported by any convenient means in liXed position aboveand in a plane parallel with the plane or" the upper surface of thegrinding disk 1. 3 indicates a holder for the stones to be ground. Thisholder for the stones to be ground consists, as shown in detail in Fig.5, of a rectangular frame divided into sections by cross bars 4, 4, andprovided'in its sides 6 andl 7 with set screws 5. The side 6 ispreferably provided at its ends with vertical rollers 3 which, inoperation bear against a lined bar 9 extending across but above and outof contact with the tace oic the grinding disk and serving to preventthe work holderrtrom being carried around with the grinding disk as itrotates. The stones or other articles to be ground 10 are clamped in thesections of the work holding trame by means of the set screws 5, aconsiderable number or' the stones to be ground being thus heldassembled so as to be all ground at the same time.

1n the operation of grinding' the stones the work holder 3 isreciprocated in radial direction across the tace of thegrinding` diskVbeing held against being carried with the grinding disk in itsrotation, by the lined bar 9 as clearly shown in Fig. 6. y1`he workholder is provided at its ends with trunnions 11 and 12 which arejournaled respectively in the lower ends of vertical arms 13 and 14,

the upper ends o which embrace and are free to move vertically on theends of a bar 15 preferably I shaped in cross section and adjustablysupported trom the cross beam 2 as hereinafter described. As the weightof the work holder 3 with the stones carried by it and the arms 13 and14, is or may be toogreat to permit the most eiiective .operation of thegrinding disk, this weight is arranged to be more or lesscounterbalanced. r1`he means for this purpose comprises arms 16 and 17pivoted at their vouter ends tothe vertical arms 13 and 14 respectivelyand 4connected between their ends by links 18 and 19 respectively, tothe bar 15, the inner ends of the arms 16 and 17 ext-ending beneath aweight 20 which rests on them being guided by rods 21 and 22 eX- tendingdownward from the bar 15, the weight by its pressure on the inner endsof the arms tending to raise the vertical arms 13 and 14, and with themthe work holder 3.V A lever 23 pivoted at 24 to the weight- 20 andhaving one end connected by link 25 to vertical arm 13 and carrying onits other end an adjustable weight 26, serves to regulate the pressureof the weight 20.

The bar 15 is supported near its ends by vertical screws 27 and 28 whichengage screwthreads formed in the bar, and are swiveled at their upperends in a bar 3() which is provided near its ends with brackets 31 andin which are jouinaled pairs of rollers and 34 which are adapted totravel on the lower flanges of the l beam 2. The vertical screws 2'? and28 are provided near their upper ends with gears 85 and 36 which are inmesh with pinions 37 on stub shafts which carry gears 3S and 39 withwhich mesh bevel gears 4 and 41 carried by horizontal shaft 42 having atone end a hand wheel 43 for operating it. By rotating the hand wheel thescrews 2? and 28 are rotated toy raise or lower the bar 15.

Near its lower end the vertical armv 14 is provided with a shaft 44onwhich is pivoted a lever 45 provided on its under side with a notch 46adapted to engage any one of a series of pins 47 carried by a swinginglever 48 pivoted at its upper end in a breekt 49 on the cross beam 2.Near its upper end this swinging lever is provided with a slot t() withwhich engages a pin 51 carried by a Y pitman 52 the other end of whichis pivoted to a crank 54 on a shaft 55 journaled in a block 56 carriedon the cross beam 2. @n the shaft 55 is a bevel gear 5( which is in meshwith a bevel pinion 58 on a shaft 59 which, by means of suitable gearingas shown, is arranged to be driven by a belt 60 from any convenientsource of power.

ln order to keep the work holder 8 from turning on its trunnions 11 and12 while the stones are being ground, holding arms 61 and each having anot-ch 623 at its end are caused to engage the frame of the work holderon opposite sides ef the trunnion These holding arms 61 Yand 62 areeccentrically mounted on the shaft 44 which is arranged to be rotated byhand wheel 64 and is locked against rotation by spring pawls 65.

ln order to permit the stones to be inserted in the work holder thelever 45 is raised to -disengage its notch 46 from the pin 4'? and isthen swung down out of line with the swinging lever 48. The arms 14 and13 and the 'parts connected with them are then moved to the right asshown in Fig. 1, until the arm 13 is clear of the grinding disk therollers 33 and 34 traveling on the lower flanges of the cross beam 2.When thus run back clear of the grinding disk, the hand wheel 64 isrotated to withdraw the ends of arms 61 and 62 from engagementwith theend of the frame of the work holder 3 and this work holder 1nay then berotated on its trunnions 11 and 12 to swing it to a vertical position.The stones may then be packed into the sections of the work holder andsecured therein by set screws 5. W hen the stones' are all in place thework holder is swung to horizontal position and secured in such positionby engaging the notches 63 of the arms 61 and 62 with the end ofthe'work holder frame, the shaft 44 being rotated to cause the arms tohold the frame in horizontal position. The work holder and the partsconnecten with it is then run forward over the grinding disk and thelever 45 is brought up and its notch 46 is caused to engage one of thepins 47 of the swinging lever 48. The machine is then ready foroperation. ln order to facilitate the movement of the work holder offfrom and onto the grinding disk the weighted end of the lever 23 may bedepressed to lift the stones free of the surface of the grinding disk.

1n operation, `after the work holder is in position, the lever 48 willbe swung to and fro by the pitman 52 and, through the lever 45, willreciprocate the work holder on the surface of the grinding disk, thepressure of the stones against the' grinding disk being regulatedby theweight 26. The screws 2'? and 26 serve te adjust the height of the workholder and may be operated through the hand wheel 43 to gradually lowerthework holder as the stones carried by it are ground away. n

lWhile the machine shown and described is particularly designed andintended for use in grinding the ends of sharpening stones which arerectangular in cross section, it is obvious that it may be used to grindthe ends of sharpening` stones of other lshages in cross section or togrind the sides or faces of such stones or the ends,` sides or faces ofother articles than sharpening stones which are adapted to be secured ina holder such as that described, and lthe invention is not intended tobe limited to the particular' use described. lt should be understoodthat l do not desire tobe limited to the particular construction shownor described as it is obvious that such construction and the arrangementof the yparts may be modified in many ways without departing from thespirit of the invention.

Having thus described my invention what l claim is:

l. ln a machine for shaping articlesby grinding, the combination of agrinding disk rotating in a 'horizontal plane, a fixed track `above andparallelwith Vthe face of the grinding disk, a frame suspended from andmovable on said fixed track, means for reciprocating the frame, a workholder carried by the frame adapted to hold the articlesto be ground incontact with the face or the grinding disk, and means carried by theframe for counterbalancing the rweight ofthe workholder.

2. ln a machine for shaping articles by grinding, the combination of agrinding disk rotating in a horizontal plane, a fixed track above andparallel with the face of the grinding disk, a trame suspended from andmovable on said track comprising a horizontally arranged bar and armssuspended from and vertically movable on said bar, a work holder carriedby said arms adapted to hold the articles to be ground in Contact withthe face of the grinding disk., and means carried by said bar forcounterbalancing the weight of the work holder.

3; In a machine fol1 shaping articles by grinding, the combination of agrinding disk rotating ina horizontal plane, a fixed track above andparallel with the face of the grinding disk, a frame suspended from andmovable on said track comprising a vertically adjustable horizontallyarranged bar and arms suspended from and vertically movable on said bar,means for reciprocating the frame, a work holder carried by said armsadapted to hold the articles to be ground in contact with the face ofthe grinding disk, and means carried by said bar for counterbalancingthe weight of the work holder.

4. In a machine for shaping articles by grinding, the combination of agrinding disk rotating in ahorizontal plane, a lixed track above andparallel with the face of he grinding disk, a frame suspended from andmovable on said track comprising a horizontally arranged bar 'and armssuspended from and vertically movable on said bar, means forreciprocating the frame detachably connected therewith, and a workholder having trunnions at its ends journaled in saidarms and adapted'tohold the articles to be ground in contact with the face of the grindingdisk.

5. In a machine for shaping articles by grinding, the combinationV of agrinding disk rotating in a horizontal plane, a fixed track above andparallel with the face of the movableV on said track comprising ahorizontally arranged bar and arms suspended from and vertically movableon said bar, means :tor reciprocating the frame detachably connectedtherewith, a work holder having trunnions at its ends journaled in saidarms, and means for holding the Work holderl in horizontal position tohold the articles to be 4ground in contact with the face or" thegrinding disk. y Y

6. In a machine for shaping articles by grinding, the combination of agrinding disk rotating in a horizontal plane, a fixed track above andparallel with the face of the grinding disk, a frame suspended from andmovable on said track comprising a horizontally arranged bar and armssuspended from and vertically movable on said bar, means forreciprocating the frame, a work holder carried by said arms adapted tohold the articles to be ground in contact with the face of the grindingdisk, and means fpr counterbalancing the weight of the work holdercomprising levers pivoted at their ends to said. arms, Julcrumed inlinks de* pending from said bar and having a weight bearing downward ontheir inner ends.

7. In a machine for shaping articles by grinding, the combination of agrinding disk rotating in a horizontal plane, a fixed track above andparallel with the face of the grinding disk, a frame suspended from andmovable on said track comprising a horizontally arranged bar and armssus pended from and vertically movable on said bar, means forreciprocatingthe Jframe, a workholder carried by said arms adapted tohold the articles to be ground in contact with the face of the grindingdisk, and means for counterbalancing the weight of the work holdercomprising levers pivoted at their outer ends to said arms, fulcrumed inlinks depending from said bar and having a weight bearing downward ontheir inner ends and levell pivotally connected at one end to one ofsaid arms, pivotally connected near its midlength with the weight andhaving a weight adjustably mounted on its free end.

In testimony whereof l aflix my signature this. fourth day of March,1920.

MALVERN A. EATON.

